IDL Routine: JULDAY_TO_YMDH

If you send me <air_jlin@yahoo.com> your email address, I'll let you know of any major bugs that are found in this library.

9 Sep 2002: Add feature to round up minute 59 to the nearest hour. Fix CATEGORY field in the comment block at the beginning of the routine.

14 Mar 2002: First public release.